Wiping Computer Memory

[bigv32]

I am selling my current gaming computer. However, there is one problem. I don't have the windows 7 install disk, so I can't reformat the harddrive. This is not "super" big deal though as I have done almost nothing personal on it (ie. use credit cards, store personal info). Really the only thing it has is some games which I can uninstall, steam which I will uninstall, and any saved passwords.

Right now I was planning on the usual clean-up functions of ccleaner to wipe the passwords, extra registry keys, and then use its wipe feature on all my "free space". Is there anything else I can do/should do short of reformatting?

Thanks

 

[MindoverMaster]

You could reformat it and put Linux on it.

Can't you do a restore point or something?

 

[Fat.Clown]

format really is the only safe option.
highly suggest you borrow a disk or "obtain" an image onto a USB first, and then use Darik's Boot and Nuke ("DBAN") to wipe all of your records clean.